How to define Indexer behaviour to an Interface?

Question

Is it possible to add the indexer behaviour from an interface?

something like this :

interface IIndexable<T>
{
   T this[string index];
}

Answer 1

Yes, it is possible. In fact, all you're missing is the getter/setter on your indexer. Just add it as follows:

interface IIndexable<T>
{
     T this[string index] {get; set;}
}